Crossword Genius

Curved line (3)

Ross

I believe the answer is:

arc

'curved line' is the definition.
(an arc is a part of a curved line)

This is all the clue.

(Other definitions for arc that I've seen before include "Rainbow, e.g." , "Bow" , "Semi-circle" , "Something used to weld" , "Part of a circular line" .)

I've seen this clue in The Times, the USA Today, The Guardian, the King Feature Syndicate, the Penny Press and the Newsday.
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